What happened to our avatars?

Hello, I just upgraded a clients site from a 2010 install of Buddypress to 1.6. Couple of weird things – in our groups and members sections all the old avatars have gone – ie those generated by registration procedure. The only ones that remain are the ones that have actually been uploaded bu myself or users. Is this correct? Does 1.6 no longer support those funny little profile avatars anymore?
Thanks
James